Introduction | 介绍

Using iOS 3.0 and later, VoiceOver is available to help users with visual impairments use their iOS-based devices. The UI Accessibility programming interface, introduced in iOS 3.0, helps developers make their applications accessible to VoiceOver users. Briefly, VoiceOver describes an application’s user interface and helps users navigate through the application’s views and controls, using speech and sound. Users familiar with VoiceOver in Mac OS X can leverage their experience to help them quickly come up to speed using VoiceOver on their devices.

iOS 3.0及之后的版本，视觉障碍用户可通过VoiceOver使用iOS设备。iOS 3.0引入的UI无障碍编程接口，帮助开发人员构建能够让VoiceOver用户访问的应用。简单地说，VoiceOver描述一个应用 的用户界面，用户通过语音朗读以及声音，导航浏览该应用中的视图及控件。熟练掌握Mac OS X的VoiceOver用户，能够快速上手，利用其设备上的VoiceOver。

iPhone applications that run in iOS 3.0 and later should be accessible to VoiceOver users. iOS and the iOS SDK support this goal by:

运行在iOS 3.0及之后版本的iPhone应用，应该为VoiceOver用户构建无障碍环境。iOS和iOS SDK通过以下方式支持此目标:

• Making standard UIKit controls and views accessible by default

  默认情况下，标准UIKit控件和视图是可访问的

• Supplying the UI Accessibility programming interface, which defines a streamlined process for making an iPhone application accessible

  提供UI无障碍编程接口，此接口定义了为iPhone应用程序构建可访问性的合理化流程

• Providing tools that help you implement accessibility in your code and test the accessibility of your application

  提供相关工具，在代码中实施、并在应用中测试无障碍特性

If you’re developing or updating an iPhone application, you should read this document to learn how to make your application accessible to VoiceOver users.

如果您正在开发或升级一个iPhone应用程序，您应该阅读此文档以学习如何开发可被VoiceOver用户访问的应用。

Organization of This Document | 文档结构

This document contains the following chapters:

该文档包含如下章节：

• Understanding Accessibility on iOS briefly describes how VoiceOver works on the device and introduces the programming interface and tools you can use to make your application accessible.

  “理解iOS上的无障碍特性”简要描述VoiceOver如何在设备上运行，同时介绍了可用于构建应用可访问性的编程接口及工具。

• Making Your iOS App Accessible provides in-depth guidance for making your application accessible to VoiceOver users.

  “构建您iOS应用程序的无障碍特性” 深入指导如何让应用程序可被VoiceOver用户访问。